| http://www.w3.org/ns/prov#value | - The preferred stereoisomers of the compounds of Formula I wherein X is a direct bond or --CH???CH--, and Z is a group of Formula II are the 3R,5S and 3R,5R isomers and the racemate of which each is a constituent, i.e., the 3R,5S-3S,5R (erythro) and 3R,5R-3S,5S (threo) racemates, with the 3R,5S isomer and the racemate of which it is a constituent being more preferred and the 3R,5S isomer being most
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